[ruby-core:123742] [Ruby Bug#21655] segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9

Issue #21655 has been updated by alanwu (Alan Wu).


A build of the master branch with options from OP crashes the same way as ruby_3_3 for me... I'll commit something later.
Because inter-procedural analysis is key to triggering the miscompilation, changes to seemingly unrelated places can dodge it.
Finding the best place to change will be easier after we learn how the GCC folks fix it.
Making code changes to dodge this while ipa-modref is active seems like playing with fire, though. 
The GCC issue exists from version 12 through 15.2.1 and on a [recent trunk build](https://godbolt.org/z/bPezbYqY5).
Maybe we need to resort to adding a check for this in `configure.ac` because even after a GCC fix not everyone will update.

----------------------------------------
Bug #21655: segfault when building 3.3.10 with GCC 15.2.1, regression from 3.3.9
https://bugs.ruby-lang.org/issues/21655#change-115132

* Author: kurly (Greg Kubaryk)
* Status: Third Party's Issue
* ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [x86_64-linux]
* Backport: 3.2: UNKNOWN, 3.3: REQUIRED, 3.4: REQUIRED
----------------------------------------
ref downstream bug https://bugs.gentoo.org/965095 - reporting upstream because I was able to reproduce the problem from ruby-3.3.10.tar.xz manually

build log excerpt; the rest will be provided as an attachment

```
gcc -O2 -pipe -march=amdfam10  -L. -fstack-protector-strong -rdynamic -Wl,-export-dynamic -fstack-protector-strong -pie  main.o dmydln.o miniinit.o dmyext.o array.o ast.o bignum.o class.o compar.o compile.o complex.o cont.o debug.o debug_counter.o dir.o dln_find.o encoding.o enum.o enumerator.o error.o eval.o file.o gc.o hash.o inits.o io.o io_buffer.o iseq.o load.o marshal.o math.o memory_view.o rjit.o rjit_c.o node.o node_dump.o numeric.o object.o pack.o parse.o parser_st.o proc.o process.o ractor.o random.o range.o rational.o re.o regcomp.o regenc.o regerror.o regexec.o regparse.o regsyntax.o ruby.o ruby_parser.o scheduler.o shape.o signal.o sprintf.o st.o strftime.o string.o struct.o symbol.o thread.o time.o transcode.o util.o variable.o version.o vm.o vm_backtrace.o vm_dump.o vm_sync.o vm_trace.o weakmap.o prism/api_node.o prism/api_pack.o prism/diagnostic.o prism/encoding.o prism/extension.o prism/node.o prism/options.o prism/pack.o prism/prettyprint.o prism/regexp.o prism/seri
 alize.o prism/token_type.o prism/util/pm_buffer.o prism/util/pm_char.o prism/util/pm_constant_pool.o prism/util/pm_list.o prism/util/pm_memchr.o prism/util/pm_newline_list.o prism/util/pm_state_stack.o prism/util/pm_string.o prism/util/pm_string_list.o prism/util/pm_strncasecmp.o prism/util/pm_strpbrk.o prism/prism.o prism_init.o yjit.o yjit/target/release/libyjit.o coroutine/amd64/Context.o  enc/ascii.o enc/us_ascii.o enc/unicode.o enc/utf_8.o enc/trans/newline.o setproctitle.o addr2line.o  -lz -lrt -lrt -lgmp -ldl -lcrypt -lm -lpthread  -o miniruby
:
./miniruby -I./lib -I. -I.ext/common  ./tool/generic_erb.rb -o builtin_binary.inc \
	./template/builtin_binary.inc.tmpl
make: *** [uncommon.mk:1316: builtin_binary.inc] Segmentation fault (core dumped)
```

---Files--------------------------------
buildlog (76.5 KB)


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